(From company literature) Pentax Auto Extension Tube Set K. Consisting of three tubes (12mm, 19mm and 26mm in length), this accessory is installed, either individually or in any combination of two tubes, between the camera body and the lens to offer a maximum magnification of 1.02X with a standard 50mm F1.7 lens mounted in normal position. Since automatic diaphragm control and open-aperture metering functions are retained, you can take advantage of Aperture-Priority AE operation for easy depth-of-field control.

Would you recommend the product? Yes |
Total Spent: $60.00| Rating: 10

Pros:

Aperature level passthru, genuine Asahi Pentax build quality

Cons:

A bit pricey

These are solidly build tubes. Very flexible with 3 tubes to create different magnifications. My m50/1.7 works great on the end. Macros are best done in manual focus, so no AF contacts aren't a problem. For what they are, they are kind of expensive - but still way cheaper than a full macro lens - especially if you already have a 50mm laying around